Frame-onStep-iterators.js

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var g = newGlobal({newCompartment: true});

var dbg = new Debugger;

var gw = dbg.addDebuggee(g);

var log;

var a = [];

dbg.onDebuggerStatement = function (frame) {

  log += 'd';

  frame.onStep = function () {

    // This handler must not wipe out the debuggee's value in JSContext::iterValue.

    log += 's';

    // This will use JSContext::iterValue in the debugger.

    for (let i of a)

      log += 'i';

};

};

log = '';

g.eval("debugger; for (let i of [1,2,3]) print(i);");

assertEq(!!log.match(/^ds*$/), true);